Furnace-grate



J. A. IPRIGL.A

FURNAGB GRATE.

Patented Feb. 1'7, 1885.

(No Model.)

-bridgewall and discharging it into the body Uterine Stearns Farma @erica JOHN PRICE, OF SCRANTON, PENNSYLVANIA.

FURNACE-GRATE.

IFECATION forming part of Letters Patent No. 312,293, dated February 17, 1885.

1'2, 1884. (No model.)

To @ZZ whom it may concern:

Beit known that I, JOHN A. PincnofSeraa ton, in the county of Lackawanna and State of Pennsylvania., have invented certain new and useful Improvements in Furnace-Grates; and l do hereby declare the following to be a full, clear, and exact description ofthe same, reference bei n g had to the accompanying draw ings, forming a part of this specification, and to the figures and letters of reference marked thereon.

This invention relates particularly to that class of grates in which the lire-supporting arms or bars are mounted upon shafts made tubular for the circulation of air through them, as shown in the patent to Price and \Vright, dated February l2, 1884, No. 293,274, and it has for its object, first, to utilize the air passed through and heated by the tubular shafts of the grate, by conducting it through a suitable of wholly or partially unconsumed gases and other products passing off fromthe fire-bed of the furnace, so as to cause the burning of such gases and products by supplying additional oxygen thereto, all as will be farther on described. It has farther for its object to provideineans whereby theair circulated th rough the shafts of the grate may be diverted into the ash-pit, and thence up through the 4fi re when it is not desired to pass it up through and out of the bridge-wall, thus providing for a'frcc circulation through the grate-shafts under all circumstances, and preventing t-he warping and cracking of the latter by the heat of the fire, as will be hereinafter Afully explained.

Referring' to the accompanying drawings, Figure l represents a plan view of a furnace and grate embodying my invention; Fig. 2, a longitudinal section ofthe same, taken on the line x x, Fig. l. Fig. 3 is a detail view of a modified form of bridge-wall; Fig. 4, a sectional view taken on the line y y, Fig. l, showing a cross-section of one of the tubular shafts and one of the tire-supporting arms or sections mounted thereon.

Similar letters of reference in the several figures indicate the saine parts.

The letters A A indicate the several secwith a series of fire-su pporting arms or collars,

b, such as shown in Fig. 4. Suitable gears, c c, connect the sections in pairs, and the shaft of one of the sections of each pair is prolonged through the casing, as shown at d, and is preferably formed to receive the handle by which the pair of sections is rotated. The form of the arms or collars L is such that they present th ree separate supportingsurfaces to the fireviz., b b2 Zig-as seen in Fig. 4, and each time one surface is turned down a portion of the lower part of the contents of the tire-chamber is cut out and dumped into the ash-pit e below, a new supporting-surface being immediately presented to the fire similar to the one turned down.

F indicates a hollow bridge-Wall extending from side to side of the furnace, and located at the rear of the fire-chamber, as shown in Figs. 1 and 2. This bridgewall may be made slanting on top, as shown in Fig. 2, or of the form shown in Fig. 3, or of any othersuitable form. W'hatever be its form, it is provided with one or more series of perforations,ff, at the top, as shown. Vithin the bridge-wall is preferably arranged a valve, G, controlled from without by a stein, g. Vhen this valve is turned into the position shown in full lines, Fig. 2, the air passing in through the tubular shafts a is discharged into the hollow bridgewall, and passes thence in a highly-heated condition, due to its contact with the shafts and with the bridge-wall, out through the perforations f at a point where it commingles with the unconsumed gaseous and other products passing off of the tire, causing the latter to be entirely consumed, thus greatly economizing fuel and reducing the amount of smoke to a minimum. The heating of the air before discharging it from` the bridge-Wall decreaseslittle if any its oxygenating effect, and it is advantageous in that the delivery of it in that condition does not tend to materially lower the temperature of the gases desired to be consumed. rlhrough the heating of the air by the tubular shafts the latter are to such an extent cooled as to prevent their being warped or cracked by the heat of the fire, or in any way affected so as to interfere with their free tions of which the grate is composed, each section consist-ing of a tubular shaft, a, armed rotation in their bearings. When the valve is turned into the posit-ion indicated by the IOO l l l wall7 and the valve in the bridge-wall for directing the air entering through the hollow shafts either directly out at ille top of the 4bride-wall7 to mingle with the products of combustion from the lire, or down into the ashpit and upward between the grate-bars7 Substantially as described.

JOHN A. PRICE.

\Vitnesses:

A. S. Srnnim'i, Inns. lt. UR-n. 

